Need help on 2 questions of OliverLehman 75 free questions

Hi,

Can anyone explian for Q 31 and Q 75 from Oliver Lehman. Below is the link

http://www.oliverlehmann.com/pmp-self-test/75-free-questions.htm

Thanks

 

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Q31

Activity 1 + Activity 2 - 2 ( since its FF -2) + 3 ( since its FS+3) + Activity 4

20+10-2+3+6 = 37 is the answer

thanks...can you also please help on Q 75